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This article in SSSAJ

  1. Vol. 41 No. 6, p. 1130-1133
    Received: May 6, 1977
    Accepted: Aug 8, 1977

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Potassium Accumulation and Movement In an Irrigated Soil Treated With Animal Manures1

  1. P. F. Pratt and
  2. A. E. Laag2



Data from a 4-year experiment with animal manures are reported. Soluble and exchangeable K and K/Cl ratios indicated that K moved into the 90- to 120-cm depth, but little if any moved below the 120-cm depth. Potassium/Cl ratios indicated that K moved down in a relatively abrupt front, that the 0- to 30-cm and 30- to 60-cm depths had nearly equilibrated with the K input, but that deeper layers had not. Soluble K accumulated in the soil in proportion to the amount of manure added and reached a maximum of 36.5% of the total soluble cations in the saturation extract of the surface layer of the plots that received the highest rate of manure. The maximum exchangeable K was found in the 30- to 60-cm depth of the same plots. The K fixed in the soil appeared to be greater than the reduction in CEC.

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